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 (2011年潍坊质量监测)When people cut down big trees,new trees should be planted.________they will have no trees to cut down in the future.

A.If not                           B.If so

C.If no so                        D.If don’t

解析:选A。考查省略。句意:当人们砍倒大树时,应该种植新树,不然的话,他们以后就没有树木可砍了。if not如果不,不然;if so如果这样的话。

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